My tuppence worth is to say that playing for dancing is not the same as playing in a session. When playing for dancing the key thing is to present the dance properly. For the musician this means practising with the team so that you each get to know each others' little ways and when in public, starting things off properly at an appropriate tempo then keeping your eyes on the dancers' feet so that it all works together.

For Rapper and Longsword (without getting into arguments about whether they are "Morris") then the same applies plus staying metronomically precise.

Ian